Ironically my voltage regulator on my G154 just went too. It actually may have been bad for some time, but my 1 year old battery had overcharged, and was dry, and the plates were bent. I had to replace the battery, and I found that it was charging at about 18 volts. The voltage regulator is original and 30 years old, and I found that there were two wires that had fallen apart at the inlet to the regulator, so I ordered one last night. I checked all of the grounds, and my alternator is about a year old as well. I was surprised that it was close to $50, when you can find some for cars at around $8. I hope that it fixes my overcharging issue, and that yours helps with your tractor too! I am ok with slowly replacing old, worn out parts to make it last for another 30 years. I love my Iseki, and I used it yesterday for about 8 hours splitting wood with my 3 point splitter, and draging logs, and I worked it again today for about the same amount of time. It is an absolute work horse!